Method and machine for forming cement posts.



2 6 4: 2 7 'ARATUS,TIJ a No. 817,670. PATEMTED APR. 10, 1906.

A. P. ROBERTSON. 7 METHOD AND MACHINE FOR FORMING CEMENT POSTS.

APPLICATION FILED MAY 4, 1905'.

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PATENTBD APR. 10, 1906.

A. P. ROBERTSON. METHOD AND MACHINE FOR FORMING CEMENT POSTS.

APPLICATION FILED MAY 4, 1905- 2 SHEETS-SHEET 2.

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2o 2 is a longitudinal section t ereo Teaee PATENT OFFICE.

ALONZ P. ROBERTSON, OF ROCHESTER, MICHIGAN, ASSIGNOR TO WILLIAM F. COWHAM, OF JACKSON, MICHIGAN.

MACHINE FOR FORMING CEMENT POSTS- Specification of Letters Patent.

Patented April 10, 1906.

Application filed May 4, 1905. Serial No. 258,848.

5 State of Michigan, have invented certain new and useful Improvements in Methods and Machines for Forming Cement Posts, of which the following is a specification, reference being had therein to the accompanying 1o drawin s.

The invention relates to the manufacture of posts formed from cement strengthened by metallic members embedded thereln.

The present invention relates to the i5 method of forming posts of such character,

and, further, in the apparatus which is employed for that purpose.

In the drawin s, i re 1 is a cross-section through the moh i for f i'min the ostls Fig.

i s. 3, 4, 5, 6, and 7 are diagrammatic views illustratin I the successive steps performed in the manu acture. Fig. 8 is an end elevation; and Fi 9 is an elevation of the complete I 2 5 mold, illustrating the bod; portion as raised and the molded post resting on the plate E.

The particular construction of post which it is the object of the invention to produce is one in which the cement body is reinforced 0 by thin metallic bars arranged at the several corners of the 0st and extendin diagonally inward. In t e manufacture 0 this post I employ a mold A,-which is preferably substantially rectangular in cross-section, but is provided with sufficient flare of its side walls to furnish the necessary draft. The side walls a of this mold are connected to each other by a false bottom piece b and also preferably by an end wall 0 at the small end of the mold, which, as shown, tapers longitudinally. Between the side walls a is arranged a detachable bottom B, which has a movement limited by pins C, passing through slots 1) in the false bottom I).

vE i s a top plate for the mold,.preferably restln upofilateraliy prbjhtingflanges c of thesi e walls a.

F is an end plate for the large end of the mold, which is detachably locked in position,

preferably by swinging bars G, pivoted to the ends of the sidewal s a and adapted to engage we, Wm, #16

with a wedge-shaped keeper I-I, secured to cross-bar I. Thus by turning the bars G inward the end plate F will be locked in position and the taper of the wedge H will force the plate in tight contact with its seat upon the ends of the walls (1.

Upon one side of the mold are arranged a mold is adapted to be rotated to reverse the same. The mold is preferably supported on ways K, which are provided with V-shaped tracks L for engaging corresponding grooves in the rockers J.

With a mold constructed as above described the post may be formed by the following met od: The mold is first placed upon the ways K in the position indicated in Fig. 1. A layer of cement is then thrown into the bottom of the mold, as shown in Fig. 3, and, after suitably tamping, a tool M is employed, as indicated in Fig. 4. This tool has an angling nose-piece, preferably at substantially an an le of forty-five degrees, and by tamping wit the tool adjacent. to the side walls of the mold the plastic material is shaped to incline from the corner upward and inward. The metallic strengthening-strip N is then laid into the mold so as to rest against the inclined face of the cement, after which additional cement is thrown into the mold to fill the same and is suitably tamped. The next operation is preferably by a tool 0, which is so shaped that it may be used for tamping or pressing down the cement. at the u per edges of the mold, so as to form inc ines, as indicated in Fig. 5. Metallic strips N are then placed against these inclined faces, and the cement is then struck off flush with the top of the mold and the top plate E placed in position. The operator next reverses the mold, which may be done by rockin it over .upon the segments J, so that it Wi 1 rest upon the top plate E, as shown in Fig. 7. The bottom B is then reciprocated longitudinally, this being permitted by the projecting therethrough. This reciprocation of the bottom loosens the cement from adhering to its inner face. Following this the swinglng bars G are turned back and the end plate F is removed from the large end of slots D in the false bottom I) and the pin C pair of rocker-segments J, upon which the the mold. The operator then lifts the body portion of the mold, preferably first moving it longitudinally a slight distance to free the sides. Durin the lifting of the mold the bottom plate is permitted to rest on the top of the molded block, and thus tearing of the corners, which might otherwise result from the adhesion of thecement to the side plates of the mold, is prevented. The indeendent u ward movement of the mold in reation to file plate B is permitted by reason ofthe pins C, which loosely engage the slots D and have cross-pins O, sufiiciently separated from the plate B to afford the necessary lost motion. Upon further liftin of the mold the ins C engaging with the alse bottom I), wil lift the plate B with the mold, and the whole may be disengaged from the molded post, leaving the latter restingupon the plate E, where it remains until the cement is hardened.

By the method and by use of the apparatus described posts may be quickly manufactured, and when complete the cement body will be materially strengthened by the metallic strips arranged at the corners.

What I claim as my invention is 1. The herein-described process of forming composite cement and metal posts which consists in placing a layer of the cement in the bottom of a mold, tamping the cement to free the same from the sides and form inclines from thelower corner of the mold, then plac ing metallic strips upon said inclines, then completely filling the mold and striking off the same, whereby said metallic strips will be embedded in the cement so as to extend diagonally inward from the corners of the 0st.

2. The herein-described method of orming composite cement and metal posts which consists in partially filling a mold with plastic material, in tampin said material adjacent to o, posite sides of t 1e mold to form inclines, placing metallic strengthening-bars, so as to rest against the inclined faces of the cement, fillin the .mold and tam ing to form downward% -inclined surfaces from the upper corners o the mold and placing metallic strengthening bars so as to rest against said inclined facesand in striking off the cement flush with the. top of the mold.

3. A mold for cement posts comprising separated side walls, a connecting false bottomand asu erposed bottom plate longitudinally movab e in relation to said false bottom, the side walls and the molded post, and means for limiting said movement.

4. A mold for cement posts comprising se arated side walls tapering toward one end, a alse bottom connecting said side walls, and a bottom plate fitting between said side walls and arranged for longitudinal reciprocation in relation thereto to free from the molded post, and means for limiting said reciprocation.

5. A mold for cement bodies comprising seplarated side walls cross-connected to each ot er, and a bottom plate having a limited longitudinal and vertical reciprocation in relation to said side plates.

6. A mold for cement bodies comprising a reversible box-mold having separate Y side walls cross-connected to each other, a bottom plate fitting between said side walls, means whereby when said mold is reversed, said bottom plate may be reciprocated longitudinally to free the same from the cement surface, and means permitting said plate to rest u on the molded body during the lifting of sai bodymold.

7. A mold for cement bodies comprising a reversible box-mold having separated side walls and a bottom plate fitting between said side walls and having a longitudinal and vertical reciprocation in relation thereto, means for limiting said reciprocation, for the purpose described.

8. A mold for cement posts comprising a tapering reversible box-mold having so arated side walls, a bottom plate fitting etween said side walls and having a longitudinal and vertical reciprocation in relation thereto, means for limiting said reciprocation, and a detachable end plate at the large end of said box-mold.

9. In a mold for cement bodies, a tapering box-mold, an end plate for the large end thereof and locking devices therefor comprising the swinging bars G pivoted to the on s of said box-mold, the cross-bar I and the wedgeshaped keeper H with which said bars G engage, for the purpose described.

10. A mold for cement bodies comprising separated side walls cross-connected to each other,-a bottom plate having a longitudinal and a vertical movement in relation to said side plates, and rockers on one side of said box-mold by means of which the mold may be reversed.

11. A mold for cement bodies comprising a reversible box-mold having separated side walls and a false bottom and top and bottom lates movable in relation thereto whereby the molded article may remain in contact with said lates while being loosened from the sides 0 the mold.

12. In a mold for cement bodies, the combination with separated side walls cross-connected to each other, of a removable top plate and a bottom plate longitudinall and vertically movable within limits in re ation to said-side walls, whereby the molded article may rest in contact with said plates while loosened from said side walls.

13. In a mold for cement bodies, the combination with side walls cross-connected to ITO each other and end plates, of a removable top vertically movable within limits in relation to said sides and ends, whereby the molded article may rest in contact with said movable,

In testimony whereof I affix my signature plate and a bottom plate longltudinally and in presence of two witnesses.

ALONZO P. ROBERTSON.

Witnesses H. W. GRIFFIN,

S. L. WILTSE. 

